Large Capacity Bike Bag - 10L large capacity, allowing you to store small tire repair tools, taillights, gloves, tissues, phones, power banks, water bottles, drinks, and other necessities you need during riding. Inside there is a mesh pocket for storing small things like keys or credit cards. The bike rack bag has a pocket and strap at the top for expansion capacity to accommodate more items, such as a foldable umbrella for easy removal and storage. High-quality materials - made of waterproof polyester material and waterproof seams seal zippers, durable and long-lasting. The interior is insulated with aluminum foil to help keep drinks and food warm or cold. Safety reflective design - The sides are designed with reflective bands to make them visible at night, which is safer for your riding. Rear light hook on the back of the bicycle tote bag for hanging taillights (taillights not included). The thoughtful design will escort you on your night ride. Portable Bike Back Rack Bag - Comes with a carrying strap that you can take with you if you leave your bike. The side-adjustable water bottle holder makes it easy to remove the water bottle and avoid falling on bumpy rides.